Since this is WPF, it may look like lots of code, but don\'t be frightened, the question is really simple!
I have the following XAML:
When you bind to a datasource in WPF, it is looking for a property of your Window's data context called "AllRoles". Check out the Model-View-ViewModel pattern for more on data binding in xaml. http://msdn.microsoft.com/en-us/magazine/dd419663.aspx